Pipe bowl cleaner



July 10, 1951 D. H. PALUDAN 2,559,994

PIPE BOWL CLEANER I Filed Sept. 5, 1946 lllllllllllf HIIIIIIIIIII H INVENTOR. I

a AQ e. 6/ BY Patented July 10, 1951 PIPE BOWL CLEANER Dan Hage'Paludan, Copenhagen, Denmark Application September 5, 1946, Serial No. 694,936 In Denmark July 13, 1943 Section 1, PublicLaw 690, August 8, 1946 Patent, expires July 13,. 19.63

3. Claims. 1

The invention relates to a. pipe bowl'cleaner with, a number of cutters, preferably four, which extendimainly in the axial direction of the cleaner and are. each at one end connected rotatably to a guide, while at the same time the guides are at right angles to a frame member and are connected. rigidly to the latter.

Such. pipe bowl cleaners: are used for the cleaning of the pipe bowl of the charred layer deposited inside the latter in the course of time.

Pipe bowl cleaners are already known in which the movable cutters are swung around spindles situated at the end opposite to the point of the cleaner. In these known constructions the cutters are swung out and in by means of a coneshaped part fitted as a non-rotatable nut on a screw, which can be turned for adjusting the cutters. For preventing the latter from swinging out of their own accord there is a special spring arrangement. In another known construction the spring has been dispensed with by elongating.

the cone shape part and letting it affect the cutters at both sides of the point of rotation.

In a third known construction there are two cutters which may be pressed from each other by means of a wedge. The cutters do not, however, move back to their initial position of their own accord, when the wedge is withdrawn.

Furthermore a construction is known with cutters made up of two resilient metal blades produced from a single steel blank, which is bent at the middle so that the cutters form the two prongs of a U. On account of their resilience the cutters are adjusted themselves to the smallest diameter, but may be forced out from this position by a shiftable member, which is adjusted by means of a screw spindle.

In these known constructions screw spindles are used for the adjustment, which entails that the adjustment is effected slowly, there being a limit to the steepness which the pitch of the screw may have.

This drawback is avoided by the construction in accordance with this invention, which at the same time produces an adjustable pipe bowl cleaner that is comparatively cheap in production.

In accordance with the invention the characteristic feature of the pipe bowl cleaner is that at their free ends the movable cutters are guided in guides situated in a guiding member which is parallel to the frame member, and which guides. on the guiding member being turned in relation to the frame member, cause all the movable cutters to be simultaneously swung in or out ac cording to the direction of rotation.

This construction furthermore possesses the advantage that the movable cutters are held fast at both ends. and supported along their full lengths, so that they do not yield, when the pipe bowl cleaner is used.

In an. especially simple embodiment of the pipe bowl cleaner in accordance with the invention the guides. consist of spiral-shaped slits cut. out, in the guiding plate.

The invention is further described with references to the drawing, where Fig. 1 shows an embodiment of the pipe bowl cleaner in accordance with the invention, viewed from the point of the cleaner,

Fig. 2 a side elevation of the pipe bowl cleaner in accordance with Fig. 1,

Fig. 3 an embodiment of the guiding plate,

Fig. 4 the pipe bowl cleaner in accordance with Fig. 2 with its cutters swung out fully,

Fig. 5 the frame plate,

Fig. 6 a cutter, and

Figure '7 is a perspective, exploded view showing the combined central frame and blade guide structure as also securing means between the parts.

The pipe bowl cleaner in accordance with Figs. 1 and 2 has four guiding blades l 3, 5, and l, and four cutters 2, 4, 6, and 8, which are fitted rotatably around spindles situated at the point of the cleaner. Two spindles of rotation 9 and ID, for example rivets, can be seen to the right in Fig. 2.

The guiding blades, which should mainly serve only as supports for the movable cutters and need therefore not be shaped like cutters, are secured at right angles to a central frame H, which, as appears clearly from Fig. 5, has slits l 2, in which pins I3 on the movable cutters may move. If the cutters do not project radially, but have some oblique direction or other, the slits l2 must likewise extend obliquely. Each of the movable cutters may be situated between two guiding blades.

The pins IS on the movable cutters project beyond the other side of the central frame It and into guiding slits I4 in a guiding plate l5, see Fig. 3, which has an opening l6 through which passes a screw, the head I! of which can be seen in Figs. 1 and 2, and on the thread of which has been screwed a tightening knob [8 having a threaded aperture I 9 which knob tightens the guiding plate against the central frame I l The guiding plate l5 may, as appears from Figs. 2 and 4, be shaped as a maneuvering knob.

In Fig. 2 the pipe bowl cleaner has its smallest dimension, the movable cutters being swung in close to the axis of the cleaner. If the tightening knob I8 is loosened, the pins l3 on the movable cutters may, by the guiding plate l5 being turned while the cutters are held fast, he made to shift a suitable distance outwards under the influence of the guiding slits l4, whereby the effective dimension of the pipe bowl cleaner is increased. When the value desired has been attained, the cutters are fixed by tightening the tightening knob l8.

Iclaim:

l. A pipe bowl cleaner of the type having a central frame, flat blade guides on said frame and radiating from the longitudinal axi of the cleaner, cleaning blades pivotally mounted at one end of said blade guides, said cleaning blades having on their free ends guide pins, a rotatable guiding plate perpendicular to said axis of the cleaner and havin slits for guiding said guide pins in a movement parallel to the corresponding blade guides and releasable means for securing the cleaning blades in any chosen position.

2. A pipe bowl cleaner as claimed in claim 1, and wherein the slits in said guiding plate are spiral shaped.

3. A pipe bowl cleaner comprising a central frame having a plurality of slits therethrough, flat blade guides secured at right angles to said central frame and having free ends, cutting blades each having a. guide tip on one end thereof and 30 being pivotally secured to said blade guides at the free ends thereof, a guide plate having spiral shaped slits therein rotatably mounted above said central frame, said guide tips on said cutting blades extending through said slits in said central frame and into said slits in said guide plate, a screw member extending centrally through said central frame and said guide plate and a tightening knob screwed on said screw member, said cutting blades being pivotable outwardly at the base thereof by rotation of said guide plate after releasing said tightening knob to increase the effective diameter of the cleaner.

DAN HAGE PALUDAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,429,900 Peifi'er Sept. 19, 1922 1,611,622 White Dec. 21, 1926 1,649,487 Riebe et al. Nov. 15, 1927 25 2,057,842 Nielsen Oct. 20, 1936 FOREIGN PATENTS Number Country Date 3,237 Great Britain of 1907 361,261 Germany Oct. 12, 1922 

